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  3. Certain messenger molecules fight damage to the lungs from noxious air by telling the muscle cells encircling the lungs’ airways

Certain messenger molecules fight damage to the lungs from noxious air by telling the muscle cells encircling the lungs’ airways

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问题 Certain messenger molecules fight damage to the lungs from noxious air by telling the muscle cells encircling the lungs’ airways to contract. This partially seals off the lungs. An asthma attack occurs when the messenger molecules are activated unnecessarily, in response to harmless things like pollen or household dust. Which of the following, if true, point to the most serious flaw of a plan to develop a medication that would prevent asthma attacks by blocking receipt of any messages sent by the messenger molecules referred to above?
选项 A、Researchers do not yet know how the body produces the messenger molecules that trigger asthma attacks.
B、Researchers do not yet know what makes one person’s messenger molecules more easily activated than another’s.
C、Such a medication would not become available for several years, because of long lead times in both development and manufacture.
D、Such a medication would be unable to distinguish between messages triggered by pollen and household dust and messages triggered by noxious air.
E、Such a medication would be a preventative only and would be unable to alleviate an asthma attack once it had started.
答案D
解析 要开发的药物是打算通过抑制肺部某些分子的自然行为来预防哮喘，选项(D)指出这种抑制不仅会在该分子的行为是多余时发生，也会在它是必要时发生，这将是这种药物的严重的缺陷。因此(D)是正确答案。选项(A)和(B)提到缺乏关于媒分子是如何产生的或如何激活的知识，但没有提到它们在肺部是如何起作用的。选项(C)描述了开发药物会花多长时间，但没有排除成功的可能性。选项(E)仅指出该药物不能做一些没有打算让它做的事。
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